This my first month of a winstrol only cycle 10mg/day. I was due for my period 4 days ago, but from what I have read that can be normal ( I just had a pregnancy test done to make sure). Anyway, last night I start getting this throbbing painful headache on the left side of my head. All the muscles were wound tight, my husband gave me some muscle relaxers, some codeine, and some aspirin, but I was in pain all night. So I made an appointment at the health clinic and they told me it was "cluster headaches" and gave me periactin( sp?) to take at night before I start my period. I have never had headaches like this before. Has anyone else had this happen to them while "on".